Encryption communication apparatus and method for controlling transfer period of key resynchronization information

This application claims priority to and the benefit of Korean Patent Application No. 2007-134464, filed on Dec. 20, 2007 and 2008-40447, filed on Apr. 30, 2008, the disclosure of which is incorporated herein by reference in its entirety.

1. Field of the Invention

The present invention relates to an apparatus and method for controlling a transfer period of key resynchronization information in an encryption communication system.

2. Discussion of Related Art

In an encryption communication system, one communication party encrypts information and another communication party correctly acquires the original information by receiving and decrypting the encrypted information.

In such a communication system, when a receiving side provides a transmitting side with location information of the receiving side and status information regarding a network between the receiving side and the transmitting side, the transmitting side controls and reports an amount of transmission data to the receiving side.

By reducing the number of packets capable of being lost in the network while the transmitting side transmits packets to the receiving side, better communication quality may be provided to the receiving side.

However, when the packets are transmitted in the above method, key resynchronization information may be dropped. When key resynchronization is not acquired even when the receiving side receives the packets, the packets should be dropped. There is a problem in that communication quality may be unsatisfactory to a user.

The present invention provides an encryption communication apparatus and method that can control a transfer period of key resynchronization information using network status report information in a communication system.

According to an aspect of the present invention, there is provided an encryption communication apparatus including: a receiving means that computes a packet loss ratio and a network transfer delay time through a received packet when the packet is received and generates network status report information for a packet size and a packet transfer period of key resynchronization information using the packet loss ratio and the network transfer delay time; and a transmitting means that transmits a packet of the key resynchronization information in the transfer period by controlling the packet size and the packet transfer period of the key resynchronization information according to the network status report information received from the receiving means when data is input.

According to another aspect of the present invention, there is provided a method for controlling a transfer period of key resynchronization information in an encryption communication apparatus, including: extracting a packet number and a packet transmission time of a received packet when the packet is received; computing values of a packet loss ratio and a network transfer delay time using the extracted packet number and the extracted packet transmission time; and generating and transmitting network status report information for changing a packet size and a packet transfer period of key resynchronization information using the computed values.

According to still another aspect of the present invention, there is provided a method for controlling a transfer period of key resynchronization information in an encryption communication apparatus, including: determining whether network status report information for changing a packet transfer period of key resynchronization information has been received when data is input; changing a packet size and the packet transfer period of the key resynchronization information according to the received network status report information when the network status report information has been received; and generating and transmitting a packet of the key resynchronization information when a point of time of transmitting the packet of the key resynchronization information is detected according to the changed transfer period.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which:

FIG. 1 is a block diagram showing an internal structure of an encryption communication apparatus according to an exemplary embodiment of the present invention;

FIG. 2 is a table for explaining a process for generating network status report information according to an exemplary embodiment of the present invention;

FIG. 3 is a flowchart showing a control flow of a receiving means in the encryption communication apparatus according to an exemplary embodiment of the present invention;

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Previous Patent Application:
Method, system, and computer program product for encryption key management in a secure processor vault
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Industry Class:
Cryptography

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